Gold ore size: 7.5 × 6.1 × 4.1 cm. Cart for carrying ore from a mine on display at the Historic Archive and Museum of Mining in Pachuca, Mexico. An ore is an occurrence of rock or sediment that contains sufficient minerals with economically Metal ores are generally oxides, sulfides, silicates, or native metals such as

Sep 25, 2015 Geological ore deposits are of many different types and occur in all Important deposits of gold, mercury, antimony, copper and base metals are of this type. Iron ores of this type are commonly termed the banded iron